package fr.idak.spring.tiles.service;

import java.lang.reflect.Field;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.stereotype.Component;
import org.springframework.util.ReflectionUtils;
import org.springframework.util.ReflectionUtils.FieldCallback;

import fr.idak.spring.tiles.util.Loggable;

@Component
public class LoggableInjector implements BeanPostProcessor {       
 public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { 
  return bean; 
 } 
       
 public Object postProcessBeforeInitialization(final Object bean, String beanName) throws BeansException { 
  ReflectionUtils.doWithFields(bean.getClass(), new FieldCallback() { 
   public void doWith(Field field) throws IllegalArgumentException, IllegalAccessException { 
    // make the field accessible if defined private 
    ReflectionUtils.makeAccessible(field); 
    if (field.getAnnotation(Loggable.class) != null) {
     Logger log = LoggerFactory.getLogger(bean.getClass());     
     field.set(bean, log); 
    } 
   } 
  }); 
  return bean; 
 } 
} 